+* recreate systemd's D-Bus private socket file on SIGUSR2
+
+* be more specific what failed:
+ Unmounting file systems.
+ Not all file systems unmounted, 1 left.
+ Disabling swaps.
+ Detaching loop devices.
+ Detaching DM devices.
+ Cannot finalize remaining file systems and devices, trying to kill remaining processes.
+ Unmounting file systems.
+ Not all file systems unmounted, 1 left.
+ Cannot finalize remaining file systems and devices, giving up.
+
+* check for compiled-in, but not active selinux, and don't print any warnings
+ about policy loading. Probably check for available selinux in /proc/filesystems,
+ and check for active selinux with getcon_raw() == "kernel"
+
+* optionally create watched directories in .path units
+
+* Support --test based on current system state
+
+* consider services with no [Install] section and stored in /lib enabled by "systemctl is-enabled"